Add support for sources to supply last modification time in DOS format.

lib/CMakeLists.txt

@@ -82,6 +82,7 @@ add_library(zip
   zip_source_file_stdio.c
   zip_source_free.c
   zip_source_function.c
+  zip_source_get_dostime.c
   zip_source_get_file_attributes.c
   zip_source_is_deleted.c
   zip_source_layered.c

lib/zip.h

@@ -257,7 +257,8 @@ enum zip_source_cmd {
     ZIP_SOURCE_BEGIN_WRITE_CLONING, /* like ZIP_SOURCE_BEGIN_WRITE, but keep part of original file */
     ZIP_SOURCE_ACCEPT_EMPTY,        /* whether empty files are valid archives */
     ZIP_SOURCE_GET_FILE_ATTRIBUTES, /* get additional file attributes */
-    ZIP_SOURCE_SUPPORTS_REOPEN      /* allow reading from changed entry */
+    ZIP_SOURCE_SUPPORTS_REOPEN,     /* allow reading from changed entry */
+    ZIP_SOURCE_GET_DOS_TIME         /* get last modification time in DOS format */
 };
 typedef enum zip_source_cmd zip_source_cmd_t;
 

lib/zip_source_get_dostime.c

@@ -0,0 +1,78 @@
+/*
+  zip_source_stat.c -- get meta information from zip_source
+  Copyright (C) 2009-2021 Dieter Baron and Thomas Klausner
+
+  This file is part of libzip, a library to manipulate ZIP archives.
+  The authors can be contacted at <[email protected]>
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions
+  are met:
+  1. Redistributions of source code must retain the above copyright
+     notice, this list of conditions and the following disclaimer.
+  2. Redistributions in binary form must reproduce the above copyright
+     notice, this list of conditions and the following disclaimer in
+     the documentation and/or other materials provided with the
+     distribution.
+  3. The names of the authors may not be used to endorse or promote
+     products derived from this software without specific prior
+     written permission.
+
+  THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
+  OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+  ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
+  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
+  GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
+  IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+  IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+
+#include "zipint.h"
+
+
+ZIP_EXTERN int
+zip_source_get_dos_time(zip_source_t *src, zip_uint16_t *dos_time, zip_uint16_t *dos_date) {
+    if (src->source_closed) {
+        return -1;
+    }
+    if (dos_time == NULL || dos_date == NULL) {
+        zip_error_set(&src->error, ZIP_ER_INVAL, 0);
+        return -1;
+    }
+
+    if (src->write_state == ZIP_SOURCE_WRITE_REMOVED) {
+        zip_error_set(&src->error, ZIP_ER_READ, ENOENT);
+    }
+
+    if (zip_source_supports(src) & ZIP_SOURCE_MAKE_COMMAND_BITMASK(ZIP_SOURCE_GET_DOS_TIME)) {
+        zip_uint16_t data[2];
+        if (_zip_source_call(src, data, sizeof(data), ZIP_SOURCE_GET_DOS_TIME) < 0) {
+            return -1;
+        }
+        *dos_time = data[0];
+        *dos_date = data[1];
+        return 0;
+    }
+    else {
+        zip_stat_t st;
+        zip_stat_init(&st);
+
+        if (zip_source_stat(src, &st) < 0) {
+            return -1;
+        }
+
+        if (!(st.valid & ZIP_STAT_MTIME)) {
+            *dos_time = 0;
+            *dos_date = 0;
+            return 0;
+        }
+        else {
+            return _zip_u2d_time(st.mtime, dos_time, dos_date, &src->error);
+        }
+    }
+}

lib/zipint.h

@@ -612,6 +612,8 @@ void _zip_set_open_error(int *zep, const zip_error_t *err, int ze);
 bool zip_source_accept_empty(zip_source_t *src);
 zip_int64_t _zip_source_call(zip_source_t *src, void *data, zip_uint64_t length, zip_source_cmd_t command);
 bool _zip_source_eof(zip_source_t *);
+int zip_source_get_dos_time(zip_source_t *src, zip_uint16_t *dos_time, zip_uint16_t *dos_date);
+
 zip_source_t *_zip_source_file_or_p(const char *, FILE *, zip_uint64_t, zip_int64_t, const zip_stat_t *, zip_error_t *error);
 bool _zip_source_had_error(zip_source_t *);
 void _zip_source_invalidate(zip_source_t *src);